Quantum Phase Fluctuations Responsible for Pseudogap

Details Quantum Phase Fluctuations Responsible for Pseudogap Quantum Phase Fluctuations Responsible for Pseudogap

2000-07-17

arxiv.org/abs/cond-mat/0007271v2

Physica C. 370 (2002) 239

Physics

Condensed Matter

Superconductivity

5 pages, ReVTeX, 1 EPS figure; final version to appear in Physica C

Scientific paper

10.1016/S0921-4534(01)00950-9

The effect of ordering field phase fluctuations on the normal and superconducting properties of a simple 2D model with a local four-fermion attraction is studied. Neglecting the coupling between the spin and charge degrees of freedom an analytical expression has been obtained for the fermion spectral function as a single integral over a simple function. From this we show that, as the temperature increases through the 2D critical temperature and a nontrivial damping for a phase correlator develops, quantum fluctuations fill the gap in the quasiparticle spectrum. Simultaneously the quasiparticle peaks broaden significantly above the critical temperature, resembling the observed pseudogap behavior in high-T_c superconductors.

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